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最近遇到好几个人在问ffmpeg如何处理网络流，刚好前段时间也在做这方面，抽空整理了下，把主要代码发出来，希望对大家有用。为简单处理，我这里只简单介绍ＵＤＰ接收ＴＳ流，其实只要是socket接收的都可以类似处理。
/* * main.c * * Created on: 2011-9-18 * Author: wudegang */#include "utils.h"#include <pthread.h>#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>UdpQueue recvqueue;UdpParam udpParam;//注册av_read_frame的回调函数，这里只是最简处理，实际应用中应加上出错处理，超时等待...int read_data(void *opaque, uint8_t *buf, int buf_size) { int size = buf_size;int ret;// printf("read data %d\n", buf_size);do { ret = get_queue(&recvqueue, buf, buf_size);} while (ret);// printf("read data Ok %d\n", buf_size);return size;}#define BUF_SIZE 4096*500int main(int argc, char** argv) { init_queue(&recvqueue, 1024*500);udpParam.argv = argv;udpParam.queue = &recvqueue;uint8_t *buf = av_mallocz(sizeof(uint8_t)*BUF_SIZE);//UDP接收线程pthread_t udp_recv_thread;pthread_create(&udp_recv_thread, NULL, udp_ts_recv, &udpParam);pthread_detach(udp_recv_thread);av_register_all();AVCodec *pVideoCodec, *pAudioCodec;AVCodecContext *pVideoCodecCtx = NULL;AVCodecContext *pAudioCodecCtx = NULL;AVIOContext * pb = NULL;AVInputFormat *piFmt = NULL;AVFormatContext *pFmt = NULL;//step1:申请一个AVIOContextpb = avio_alloc_context(buf, BUF_SIZE, 0, NULL, read_data, NULL, NULL);if (!pb) { fprintf(stderr, "avio alloc failed!\n");return -1;}//step2:探测流格式if (av_probe_input_buffer(pb, &piFmt, "", NULL, 0, 0) < 0) { fprintf(stderr, "probe failed!\n");return -1;} else { fprintf(stdout, "probe success!\n");fprintf(stdout, "format: %s[%s]\n", piFmt->name, piFmt->long_name);}pFmt = avformat_alloc_context();pFmt->pb = pb; //step3:这一步很关键//step4:打开流if (avformat_open_input(&pFmt, "", piFmt, NULL) < 0) { fprintf(stderr, "avformat open failed.\n");return -1;} else { fprintf(stdout, "open stream success!\n");}//以下就和文件处理一致了if (av_find_stream_info(pFmt) < 0) { fprintf(stderr, "could not fine stream.\n");return -1;}av_dump_format(pFmt, 0, "", 0);int videoindex = -1;int audioindex = -1;for (int i = 0; i < pFmt->nb_streams; i++) { if ( (pFmt->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&(videoindex < 0) ) { videoindex = i;}if ( (pFmt->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) &&(audioindex < 0) ) { audioindex = i;}}if (videoindex < 0 || audioindex < 0) { fprintf(stderr, "videoindex=%d, audioindex=%d\n", videoindex, audioindex);return -1;}AVStream *pVst,*pAst;pVst = pFmt->streams[videoindex];pAst = pFmt->streams[audioindex];pVideoCodecCtx = pVst->codec;pAudioCodecCtx = pAst->codec;pVideoCodec = avcodec_find_decoder(pVideoCodecCtx->codec_id);if (!pVideoCodec) { fprintf(stderr, "could not find video decoder!\n");return -1;}if (avcodec_open(pVideoCodecCtx, pVideoCodec) < 0) { fprintf(stderr, "could not open video codec!\n");return -1;}pAudioCodec = avcodec_find_decoder(pAudioCodecCtx->codec_id);if (!pAudioCodec) { fprintf(stderr, "could not find audio decoder!\n");return -1;}if (avcodec_open(pAudioCodecCtx, pAudioCodec) < 0) { fprintf(stderr, "could not open audio codec!\n");return -1;}int got_picture;uint8_t samples[AVCODEC_MAX_AUDIO_FRAME_SIZE*3/2];AVFrame *pframe = avcodec_alloc_frame();AVPacket pkt;av_init_packet(&pkt);while(1) { if (av_read_frame(pFmt, &pkt) >= 0) { if (pkt.stream_index == videoindex) { fprintf(stdout, "pkt.size=%d,pkt.pts=%lld, pkt.data=0x%x.", pkt.size, pkt.pts,(unsigned int)pkt.data);avcodec_decode_video2(pVideoCodecCtx, pframe, &got_picture, &pkt);if (got_picture) { fprintf(stdout, "decode one video frame!\n");}}else if (pkt.stream_index == audioindex) { int frame_size = AVCODEC_MAX_AUDIO_FRAME_SIZE*3/2;if (avcodec_decode_audio3(pAudioCodecCtx, (int16_t *)samples, &frame_size, &pkt) >= 0) { fprintf(stdout, "decode one audio frame!\n");}}av_free_packet(&pkt);}}av_free(buf);av_free(pframe);free_queue(&recvqueue);return 0;}